Jack structure



Dec, 30. 1924. 1,521,434

. R. A. CLARKE JACK STRUCTURE Filed May 24, 1923 2 Sheets-Sheet 1 4 i-igl.

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Dc, 30. 1924:.A 1,521,434

R. A. CLARKE JACK STRUCTURE Filed May 24, 1925 2 SheeiiS-vSheetI 2 Richard FL. ElErKE akamu# Patented Bee. .30, 1924.

UNM'F@ RICHARD A. CLARKE. OF CHATTANOOGA,

TENNESSEE, ASSIGNO'R OE ONE-HALF T0 THOMAS HLCLAY, OF CHATTANOQGA,TENNESSEE.

JACK STRUCTURE.

Application filed. May 24,

To all whom t may con/cera.'

Be it known that l, RICHARD A. CLARKE, a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful improvements in Jack Structures, of which the following is a specification.

This invention relates to improvements in lifting jacks.

The primary object of this invention is the provision of improvements in lifting jacks such as set forth in Patent #1,433,069, of the U. S., granted to me Qctober 24, 1922.

An important object of this invention is the provision of a lifting jack embodying novel lifting means whereby the jack can be quickly and conveniently elevated or lowered.

A further object of this invention is the provision of improvements in steps or supporting devices for jacks.

Other objects or advantages of this invention will be apparent during the following detailed description.

In the accompanying drawings, forming a part of this specification and wherein similar reference characters designate corresponding parts throughout the several views Figure 1 is a side elevation of the improved lifting jack.

Figure 2 is a fragmentary front elevation of the lower part of the lifting jack.

Figures 3 and 1 are transverse cross sectional views taken through the improved lifting ack showing respectively locked and unlocked positions of the lifting portion of the liack.

Figure 5 is an enlarged perspective view of an adjustable step member used in connection with the lifting jack.

Figure 6 is a side elevation of a novel type of handle used in connection with the lifting jack.

Figures 7 and 8 are transverse cross sectional views taken on their respective lines of Figure 6 of the drawings.

Figure 9 is a cross sectional view, taken substantially on the line 9 9 of Figure 1.

Figure 10 is across sectional view, analogous to Figure 9 although showing differently adjusted positions of the details thereof.

Figure 11 is a fragmentary cross sectionalL 55 view, taken through a portion of the lifting 1923. serial No. 641,231.

jack, showing the manner in which a fulcrum bar thereof may operate in a supporting base.

In the drawings, wherein for the purpose of illustration is shown but the preferred embodiment of this invention, the letter A may generally designate the vehicle jack` which may include a. supporting base B', standard C; lifting member or Vsleeve D; means E including a handle F for lifting of the sleeve D upon the standard C, and a novel step member' H for cooperation with the sleeve D.

It is preferred to provide the parts of the improved jack of stable construction and durable material. To this end, the base B preferably comprises a supporting plate 15 having a longitudinal web 16 arranged in a vertical plane thereon. Preferably integral with. the forward end of the vertical web 16 is formed the vertical standard C, which is of novel construction. The body portion 17 of the standard. C is preferably integrally formed with the base B, and provides a flat side surface 18 which is arranged in a plane at an acute angle with respect to the plane of the supporting web 16. A front surface 19 is preferably provided upon the standard body 17, arranged at a plane at right angles with respect to the side 18; the juncture 20 provided longitudinally of the body 17 at the intersection of the sides 18 and 19 preferably being rounded to provide a convex surface. It is preferred to provide a lateral offset 21, integral with the body 17, extending longitudinally of the standard C and oppositely arranged from the side 18, which converges to a point 22; the distance between the convex edge 20 of the body 17 and the edge 22 of the portion 21 designating the maximum width of the body 17. The front surface 23 of the offset 21 is arranged at a plane at an obtuse angle with respect to the front surface 19, to provide a vertical edge 24, forwardly of the body 17, against which the sleeve D will abut, as will be subsequently described. At the side 25 of the body 17 directly opposite the side 18, it is preferred to attacharack plat 26, asby bolts 27% which upon a rear portion thereof is preferably provided with teeth 27 inclined upwardly as to provide the substantially horizontal supporting surfaces 29. The teeth 27 face laterally of the standard C in the same direction as the offset 2l of the body portion l? of said standard, although arranged vertically at the rear of said standard, whereas the offset 2l is forwardly and vertically arranged upon said standard.

Referring to the sleefe D, the saine is preferably polygonal in cross section, including' side walls 3() and 3l, and front and rear walls 32 and 32a respectively. The sleeve VD adapted for vertical reciprocation upon the standard C and preferably has the upper end thereof opened for detachable reception of a supporting' seat or saddle B5. Adjacent the lower end of the side wall 3l, it is preferred to provide a toothed plate 86, rigidly aiiixed tothe side wall 3l as byvmeans of bolts The lower portion of the sleeve D may be cut away so that the vteeth 556 of the plate 36 may extend into the passageway of the sleeve D, substantially is illustrated in Figure 2f of the drawings, where y they may cooperate upon the teeth 27 of the standard C. It is to be noted that the plate 36 is rigidly Vbolted to the sleeve D, and that the teeth thereof can only be intermeshed or disengaged with respect to the teeth 27 of the standard C by lateral shifting of the entire sleeve D. `Normally, when the teeth of the standard and sleeve intermesh the slee-ve" bears a relation to thestandard C, substantially as is illustrated in Figure 3 of the drawings. lnV this position, the front wall 32 of the sleeve may abut the vertical-edge 24 forwardly of the standard body 17, while ,the side wall 30 of the sleeve D may abut the concaved vertical edge 2O of the standard body 17. The vertical edge 2st of the body 17 acts substantially as a fulcrum for the lateral movement of the sleeve D, so that the same may be shifted into the position illustrated in 'Figure 4 of the drawings, for disengagement of the standard and sleeve teeth. in this position, the inside surface of the 'sleeve wall 30 rests in abutting` engagement with the side surface 18 of the standard body "17. 'As the length and width of the standard C are substantially equal to the clearance provided in the passageway 40' of the sleeve D,-it is obvious that the sleeve may have a lateral rocking movement, such as above described, without liability of loose play laterally or forwardly of the standard C. Y

Referring` to the lifting means Fnfthe same preferably comprises a fulcruin lever 5, bifurrated at its lowerend as to provide spaced depending arms l? and 48 adapted to straddle the base web 16, and to be pivotally secured thereto at their lower endsas by means of a pin 49. The aperture 50 in the web 16 which receives the pin e9 permits the pin to rock laterally with respect to the plane of the web 16,

so that the fulcruin lever 415 may be tipped laterally with respect to the plane of the supporting' web 16 to a limited degree, substantially as is illustrated by the full` and dotted lines in Figure ll of the drawings, A.` shoulder 5l is preferably provided upon the web 16 rearwardly of the fulcrum lever 85, against which the latter may contact to limit the rear movement of the same.4

The lever l5 is, of course, movablein a vertical plane toward the standard C. The Y upper end of the supporting,` fulcruin lever l5 1s preferably brlucated, as at 52, whereby the same may beI pivotally attached to of whicliare substantially T-shapedA in cross sect-ion providing a substantially vertical plate portion 62,v and a flange 63 ext-ending centrally and longitudinally therealong and arranged in a plane at right angles thereto. purpose indicated in my patent above referred to, for disposition within the opening A of the soclret end 64 of thehandle l Referring'to the stepH, the same is pref- The fingers areI arranged for the erably Aformed to provide a forward supporting portion'65 having` the'upper surface vthereof substantially arranged at rightangies to thel rearsurface 66 thereof. Attachingr arms 67 and 68 are preferably provided,

extending' in parallel relation, at rightl angies to th'esurface 66, and of course integral with the forward portion 65, which are adapted to receive theliftingsleeve vD therebetween. At their free'ends, the attaching arms 67 and 68 preferably provided substantially vertical shoulders 70 whichy are adapted for engagement against upwardly extending projections Tl of lugs 72 arranged on opposite sides of the lifting sleeve D and preferably integral thereivith. `The step lil is assembled upon the sleeve D, so that the forward portion '65 extends outwardly from the Afront' surface of said sleeve, and has the attaching arms lying in substantially abutting relation upon opposite side surfaces of the attaching; sleeve D with the shoulders 70 engagingin firm connection the-extensions 71 of the lugs 72; ln this position the rear surface 66 rests inr abuttingvrelation against the forward surfacefof-,the sleeve-:F

D. Any weight coming onthe step H will of course be supported thereby although the step ll may he quickly and conveniently detached from the sleeve D so that the` same may be selectively positioned upon any of the series of lugs 72 which are vertically arranged at opposite sides of said sleeve.

Referring to the handle F. the saine is preferably longitudinally adjustable and includes the socket portion Gl above mentioned. and the extension handle 7 rl`he socket portion G4 at its forward end is provided with a substantially T-shaped slot 63 for the reception of the T-shaped prongs 60. .A portion 76 of the socket section 64 is preferably provided with a guide groove 'T7 inwardly of a side face thereof, within which the extension sec-tion 75 may fit for longitudinal adjustment. A clamping bolt 79, preferably of the wing nut type, is provided upon the extension section 75. transversely extending through a longitudinal slot 8O provided in the portion 76 of the socket se"- tion 6111. whereby the sections Get and 75 may be clamped together in any predetermined longitudinal adjustment. handle gri p S1 is preferably provided upon the free end of the extension section 75.

.Referring to the operation of the improved jack, the step H. having been attached upon a pair of the prongs 72 as above described, it is merely necessary to place the jack below the article to be worked upon. rlhe. handle F having been attached upon one of the prongs 60, it is merely necessary to laterally shift the lifting means E for a slight degree, as above outlined. until the intermeshing teeth of the standard and lifting sleeves are out 0f engagement. By bearing upon the handle F, the sleeve. D may then be elevated for jacking purposes. By eturn shifting of the lifting means lil. the teeth ofthe lifting sleeve and the standard may again be in relative mesh at the new elevation for supporting an article.,l This jacking operation may be continued until the operation is complete. The saddle or seat 35 may of course be used for engaging an article to be elevated in lieu of the detachable step H.

From the foregoing description of this invention, it is very apparent that a lifting jack has been provided, which is relatively simple in constri'iction, and the parts of which are so assembled that the same can be quickly and conveniently used for jacking purposes. The outstanding features of the invention are the detachable and adjustable step H, which may be selectively used in place of the saddle 35; the novel means by which the lift may be elevated upon the jack standard, and by means of which the 'jack may be conveniently and safely lowered when a weight is imposed upon the step thereof. It is extremely difficult in the type of jack such as provides an ordinary pawl and rack to lower the same when a load is imposed thereon. However it is obvious that with the lifting means here employed, lowering` may be effected conveniently as elevation.

A further Vimportant feature of the invention is the adjustable handle.

Various changes in the shape, size and arrangement of parts may be made to the form of invention herein shown and described, without departing from the spirit of the invention or the scope of the claims.

I claim:

l. A ack comprising a base, a standard, a lifting member movably arranged upon the standard, means on the standard and lifting member for engagement whereby they may be held at a predetermined adjustment, and common means for laterally shifting of the lifting member to permit disconnection of the parts of the first mentioned means and then shifting the lifting member vertically along the standard.

2. A jack comprising a standard having a series of teeth arranged therealong, and a lifting member slidable upon the standard Y and having limited turning movement thereon, said lifting member having teeth thereon adapted for engagement with the teeth of said standard when the lifting member is turned in one direction and operating means for said lifting member mounted for vertical swinging movementv and horizontal rocking movement whereby said lifting member may be turned upon said standard so that the teeth thereof may be disengaged from the teeth of the standard and the lifting member then moved along the standard.

3. As an article of manufacture, a jack structure comprising a standard, a lifting member movable along the standard, a series of lugs oppositely extending from the sides of said lifting member having extensions upwardly thereon, a` detachable step associvated with said lifting member including attaching arms for cooperation against the upwardly extending portions of said lugs so that said step may extend forwardly of said lifting member, and an operating lever having engagement with said lugs for imparting vertical movement to said lifting member.

t. A jack comprising a base, a standard supported by the base, a lifting member slidable upon said standard` a fulcrum lever pivotcd to the base, and a lifting lever pivoted to the fulcrum lever for adjustment of the lifting member along said standard, said lifting member being laterally movable by operation of said lifting lever whereby the same may be connected or disconnected with respect to said standard.

5. A jack structure comprising a base, a. standard having a series of teeth therealong, a lifting member having teeth thereon for l l i for the base, a lifting member movable along' the standard, means for connection ofthe lifting member to the standard, and a lift-- ing device fulciumed upon said base for lateral movement whereby the lifting' member ma7 be laterally moved upon said standard for disconnection of the iirst mentioned means. Y

RICHARD A. CLARKE. 

